Facebook send button to all friends - facebook

I just want to know is it possible to to use send button of facebook to send message to all the contacts?
I have seen many people have achieve that but is it even legal to do that?

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Facebook Message To All Friends

Is there any way by which I can get all the friends using FB api and than message all of them.
Which approach is better to achieve it, a bot or using facebook api?
If Bot, than which bot can be used as a kickstart, which programming language is preferred?
JAVA,ASP.NET
It is not possible to get all friends - only those who authorized your App. Also, it is not possible to send a message to friends with the API, you can only use the Send Dialog and let the user specify the recipient on his own: https://developers.facebook.com/docs/sharing/reference/send-dialog
What you want to achieve would be possible with a bot though. Users can register to get messages from the bot, so you can create an alert system with it. More information: https://developers.facebook.com/docs/messenger-platform/
It would be a general alert system though, not between friends. For that, i would recommend not using Facebook but Emails.

Count sends through Facebook send button

Is there any way to know how much people a user has sent a message through Facebook's send
button on a website ?
If not, is there any other way to achieve this kind of thing with another plugin ?
Thanks in advance
This Document clearly mentions that if you register your domain on facebook insights, you will be able to gather analytics about the Send button.

Is sending an email to username#facebook.com an allowed means of contact?

I've noticed that I can send email to username#facebook.com and it will get delivered to a user's Facebook inbox. Is this allowed to be done programmatically (eg send via SendGrid to re-engage users)?
Does anyone have any experience doing this? If it's allowed is there anything to watch out for or be aware of?
You can do this programatically, but Facebook is smart about it. If you get an email from someone Facebook doesn't know or you aren't friends with, then it will go to the Messages->Other section. If it's an email that maps to a Facebook profile that is your friend, it will show up in your inbox.

How does RockMelt send Facebook messages?

Everything I've read says that you can't send messages but in RockMelt you can send your friend a beta invite through Facebook messages.
Are they using a preview of the Inbox API? Is there another way they're doing this?
This was taken from an answer on Quora that Eric Vishria the CEO of Rockmelt said:
"If a user wants to invite a friend who has not signed up on our site, we generate a download link, and pre-populate a Facebook message (in our own UI) that the user can edit/tailor and click Send, or copy and send via some other means (email, chat...).
We do not auto-send Facebook messages and the messages aren't from us, they are user to user.
If a user invites a friend who has signed up on our site (via the "Hook 'em up" button) that sends a notification to our backend that a user has been hooked up and we send that friend an email that such and such user has hooked them up. We are able to do this because when users sign up on our website, they connect via Facebook and authorize our application to send them email.
We spent a lot of time making the system not spammy (no auto posts to feeds, no automatic emails, etc....) where invites go to people who want them or users have to take an explicit action to tell their friends about it."
http://www.quora.com/What-Facebook-permission-enables-an-app-to-send-user-to-user-messages?redirected_qid=97754
To send a message to a friend you can use the Send Dialog, similar to the Feed dialog that will post to the wall but it lets the user select one or more friends and send a message:
https://developers.facebook.com/docs/reference/dialogs/send/

Facebook: Best way to allow one Facebook user to send a secure link to another Facebook user?

Hey, I'm a product management guy looking to understand how we can deliver audio clips into Facebook. Specifically, I'd like to allow a user (a "sender") who is logged into my iPhone app through Facebook connect to send a link for an audio file to another Facebook user (a "recipient" who has never logged into my app). I understand that it's not currently possible for this link to be sent as an outside email to the recipient, or even as an internal Facebook message. Is that still true?
If so, I'm wondering if it's possible (and advisable?) to post it as a chat message, or as an invite that is posted to the recipient's wall. For the chat message, if it's possible then what are the downsides of that method? For the invite, I realize the wall post will only be visible to the recipient, but I'm concerned that the recipient may not realize that and will think that the audio file is available to anyone who views his profile.
As such, for the invite method, I'd like to require the recipient (after they click a link in the wall post invite) to login to our web site where the audio is hosted via Facebook connect before listening to the audio. Is it possible to accomplish that? In other words, will I be able to know when the person logs in through Facebook connect that he is the recipient? In addition to a token in the audio link URL, how do I track that? Will I need to track a user ID or something?
Thanks in advance for your thoughts!
I'd go with the wallpost method.
I'd implement it by letting the initial user share a link on a friend's wall saying "User has shared a song with you! Click here to open it!" or something like that. When any user clicks that link, prompt for install and once they're authenticated, show them any files that are theirs (and yes, you'll need to check their user ID vs. the user IDs that were stored as links in your database).
If it's not the friend who clicks the link, they won't see anything (or they'll see something different). You could even use a customized link and show an error if an unauthorized user clicks to that page.
For what it's worth, this is how Amazon handles giving Amazon gift cards via Facebook.
If this is unclear or too vague, let me know and I'll clarify.