Sorry to ask, but the account in question here is it a newbie account? Or an established member? If it's the former you can simply just ignore the message but if you're curious to know what he's inviting you to then you can continue the conversation with him/her but you should be extremely careful whenever they send any link to you.
If the account is established then you probably should continue the conversation because they might be inviting due to something you normally do here on bitcointalk and thought you'll be fit for a certain job, but you should also keep in mind that the account could also be controlled by a different person entirely who has some malicious intentions for you.
In whatever decision you choose to go with just make sure you're extremely careful and any slight sign of a scam make sure you report them to the forum so as to alert others that were also contacted.