People give them to আপনি দ্বারা adding them to মতামত they leave on your wall, which is in your profile. They'll often give শ্রদ্ধার্ঘ্য for good contributions, as thanks অথবা just in general conversation. ফোরাম competitions also tend to have শ্রদ্ধার্ঘ্য as prizes for the winners.
