Some time before but mostly on these Internet days I've seen people not using commas in situations like shown below.
At the start of letters or e-mail messages:
Hi Paulo
Hi everyone
I think these should be:
Hi, Paulo, (or Hi, Paulo!)
Hi, everyone, (or Hi, everyone!)
- - - -
At the start of sentences with please:
Please help me.
I think these should be:
Please, help me.
- - - -
At the end:
I like it too.
I think this should be:
I like it, too.
- - - -
Please, what do you say?