Twitter @ Position makes the difference

There difference between @ in the front and backside of a character makes a huge difference

If you want all of your followers to see your tweet in their stream, you MUST start a tweet with a character and not with @username.

The tweet text starting with @ will only visible only To you and the person attached with @ symbol (@selva0ganesh) this won’t be visible to your audience/public

“@selva0ganesh is a digital marketing expert in Chennai” – Only to SelvaGanesh, me and the my followers who follow @selva0ganesh

“In Chennai @selva0ganesh is a digital marketing expert” – This tweet will be visible to everyone (public), even If any single character before the @ symbol (even a full stop ‘.’ Will be considered) .@selva0ganesh will be visible to public

@ Symbol used in the first character of tweet will be Consider as ‘To’ address, which is like sending this message to @this person, like composing the mail

Ref