YouTube character counter
Title limit: 100 characters
5,000 characters of description, 100 of title
The count here is the description. The title is a separate field with its own ceiling of 100 characters, and it is the one that decides whether anyone clicks.
Only the first three lines show above the fold
Everything after them sits behind the show more control. Links you actually want followed belong in the first 150 characters or so.
Echoia does the rest: publishing to ten networks, every comment and message in one inbox. Free for three accounts.