As many as you like! There are no limits on how many direct messages or group discussion posts you make through the app or how many pages you choose to visit.
Literally just a minute. All you need to do is provide a user name, age, and gender, and you can start flirting and dating instantly.
Reasonably safe, and it's highly rated on Google. However, the profiles' anonymity means it pays to be cautious about what information you are sharing online.