On Facebook, you see 笑 getting used a decent amount to mean "lol". To my American eyes, using something that literally means "smile" - and even looks semi-subconsciously kind of like an advanced emoticon of somebody winking their eye - comes across as being more feminine than the clearly gender-neutral "lol". But that may not be the common consensus, and it is apparently the only real equivalent to "lol" in Japanese.
Are guys generally supposed to use this? Are there any restrictions like that on this character?