What dos '>>' or '<<' mean?

[Bambi]

Basically on twitter & other social websites people write things like 'when my bestfriend lies to me.<<<<' Is it a symbol or does it stand for something? I know this might be a stupid question but I feel so late lol help please?

[Alyssa]

It's the greater than or less than symbols.
> is greater than
< is less than
Example: Bacon>>>> School<<<<
bacon is good, so it gets the greater than sign. School is not good so it gets a less than symbol. Basically its the thumbs up thumbs down sort of thing. just with >> (thumbs up) and <<(thumbs down) if that makes sense lol its hard to explain