There is no specific number it really depends on what else is trending. If Justin Bieber is trending, for example, then you can assume that there are a lot of tweets mentioning him and so you'll need to send thousands to trend higher than him.
Twitter: Trinador (The web site is called the same way: Twitter). Tweets: Trinos (In Internet are used both "tweets" and "trinos").
You can't actually include pictures in your tweets. However, you can use TwitPic to upload your pictures which then tweets the link on your Twitter.
According to the latest statistics, Twitter reaches 200 million tweets a day.
It really depends on how often the other trending topics are being posted. It would be a good idea to look at a few and see how many new tweets there are one minute later (twitter does this for you, look for the notice at the top that will say "20 new tweets" etc) For your topic to trend it will generally need to have more or around the same number of tweets those are getting.
A follower is someone who "follows" your tweets. Your tweets will appear on their timeline. Twitter follower - is someone who follows and subscribes to your tweets or post.
There are 200 million tweets per day.
If you are not a member of twitter, but read someones tweets is it anonymous?
by using computer
He seems to be a JW by his twitter tweets
Beyonce's twitter is twitter.com/beyonce. She never tweets though.
To send tweets you must make a Twitter account.
When you follow someone on Twitter, their tweets will then appear on your "timeline". This means that you don't have to go to someone's individual profile to look at their tweets.