He lives in Nigeria Africia and I live in FL we have been dating over a year and I can not afford to go there to marry him. For him to get a visa to come here is very difficult can we marry over web cam?
As to whether the marriage itself is valid, this is more of a family law question rather than immigration and I suggest posting in that forum (I doubt it, though).
But for immigration purposes, the marriage wouldn't be valid for immigrant petition purposes unless you were both physically present at the ceremony and the marriage was consummated.
Even to apply for him as a fiance, you would need to prove that you met in person within the last two years or that it is customary in your cultures for you not to have met first.