what do these signs mean on twitter > and <?

[Dee]

i see people put this > and this < on twitter and idk what it means
like this for example:
starbucks >
what does it mean?
NOT THE MATH TYPE OF SYMBOL..

[Rain]

It means what the math symbols represent: greater than or less than

Starbucks > would mean "Starbucks is better than > this. or all."

Or like:
stubbed my toe <<<<<< ; which means i stubbed my toe and it sucks more than <<<<< everything else in the world