Twoo or Twoo.com is a social discovery platform launched in 2011 by Massive Media. Users create profiles, upload pictures and chat with other users. A paid subscription gives the user access to more features such as browsing invisibly and seeing who likes the user or who read the users messages.

How can I tell if someone has blocked my number?

If you get a notification like Message Not Delivered or you get no notification at all, thats a sign of a potential block. Next, you could try calling the person. If the call goes right to voicemail or rings once (or a half ring) then goes to voicemail, thats further evidence you may have been blocked.