If by limit profile, you mean "protect" it, then you go to your settings (by clicking on your username in the top right corner) and go to account. Then just near the bottom is an option that says "Tweet Privacy". Check the box to protect your tweets! Don't forget to save your settings.
The join date on the Twitter profile cannot be removed.
There is not an limit
Twitter about it... that's what i do!
He doesn't have Twitter.
The Avi on Twitter is your profile picture (Avitar).
By advertising your profile.
Profile pictures on Twitter are usually refered to as 'icons', although there is no official name for them.
if you do not have a picture on twitter that is what comes up as your profile pic.
Its basically your twitter "profile picture"
No, there is no way of finding out who has viewed your profile.
Go to settings>Profile and change the profile pic.
As of my last update, Twitter allows users to include one website link in their profile bio. Additionally, users can also add links to their tweets, but there is no specific limit on the number of links within individual tweets. It's important to note that features may change, so it's advisable to check Twitter's current guidelines for the most accurate information.