If I know you through a group, or a forum or something, by all means send me a friend request - I'll be happy to accept. Just bear in mind I'm not online much for chatting as the IMVU client hates me! If I don't know you, please don't be offended if I don't accept. I'm always happy to chat through messages though.
I generally use this only to save stuff I intend to buy in future, gifts are in no way expected (although always appreciated). A friendly message or a review on one of my products is the best thing you can give me. :D