Mass text isolation and copying

Going by what I could find out about twitter handles, the "@dsfsdfd" starts the message. If that is the case, then this will extract that portion to column B if the text is in column A

Formula:

=MID(A1,1,SEARCH(" ",A1))

If you need the rest of the text without the "handle" then enter this in column C and copy down.

Formula:

=MID(A1,SEARCH(" ",A1),LEN(A1)-SEARCH(" ",A1))