The most common reasons that they give for needing money are not being able to afford a passport, visa, other travel documents, or plane tickets (often to come see you); an emergency stay in the hospital that requires a huge sum of money; getting robbed while traveling; or not being able to access their money from abroad.
There’s a huge variety of reasons that you could get.
It’s possible that it’s someone looking for an affair on a dating site The Internet seems ecstatic about the Ashley Madison hack, with millions of adulterers' and potential adulterers' details hacked and released online, with articles outing individuals found in the data dump. Even if someone’s profile looks legit, there are other signs to keep an eye out for, especially during the beginning of your communication.
This isn’t a dead giveaway, but it’s something to watch out for.
These methods give them better access to you and can help them gather additional information that they can use to con you.
Don’t fall for it: there’s nothing wrong with staying in touch via the dating site.
They’ll hit you with the full force of their charm; they’ll say sweet things, compliment you a lot, and talk about how perfect you are for each other within the first couple weeks.
Think about if you would find it strange for someone to be acting like this if you just met in real life.
If someone sends you a message and says they’d like to get to know you, save a copy of their picture and use Google’s reverse image search to see if anyone has posted about that photo being used for a scam.