After creating a VF page needing to insert a new task,
the new task was not created for me as well.

I found out the task is not created automatically,
but IS created due to a user triggered event.

I added a button on the VF page "Save as Task".
And put the task creation in the Apex method inkoked by the button.

This works like a charm.

P.S.
I checked the documentation and please note:
It is NOT possible to create a Task in a Constructor

Insert Task controller not executing from VF page
According to Why 140 characters and how to write more the limit on tweets was 140 because the SMS message limit is 160. They wanted tweets to be sent in one text (with space for username).

However, if a limit was not already in place, what would be a good limit?

Would 140 still be chosen? Have their been studies on the balance of enough space to get your point across and a short enough limit to keep updates quick and easy to read.

Would it be better for example to limit on number of words?
