[dmbass]

I'm pretty sure, I (and none of us in my family) even remotely know this 'advancetehri' guy

Doesn't change the fact that anybody can enter any phone number and upload it to Facebook.

when I clicked that link and when @iambibhas clicked that link, we both got immediate friend request from 'advancetehri'.

This sounds like an oversight on Facebook's side. The link should only to be used by one account of the person invited.

Evil plan to grab new users?

No.

[iambibhas]

You really don't get the point? Friendship request is an action From one user(say B) to another user(say A). Person A got sms because B sent a friend request to A only! Why the hell would I or @rish404 get a friend request from person B is we click that link? The link is a notification sms of an event, it should not contain an action that says "Send friend request to anyone who clicks this link from person B". Do you now understand my point?

[pasbesoin]

Speculation: When someone generates friend requests e.g. by allowing Facebook to mine their address book, FB only has to generate a single friend request ID. (I'm not saying this is the "right" way to do this.)