Using Twitter is absolutely free! Once you create an account, you can follow people, send tweets, and post your status free of charge. If you need anymore help with Twitter you should check out this online training site called grovo.com
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There is no way of us knowing who it is. Try searching for your name within Twitter to see who is posting tweets about you.
You can make trivias on twitter by searching some facts and then posting it on twitter :)
No, you can post links if you want to.
Yes it is.
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You are either posting too much which puts you in "Twitter Jail" or you are retweeting too much - this is seen as spam.
His is building a treehouse and posting photos of the progress on his Twitter.
Joining Twitter is free, using Twitter is free.
The best way to get information on investing would be to contact Twitter directly. See the related link for various email addresses and a posting address.
No. It obviously can't be some robot posting things on Facebook, Twitter, etc.
No.