(NOT a duplicate of Tourist Visa B1/B2)
Earlier last year, I went to the US for a business trip. In preparation for it, even though I applied for a B1/B2 visa, I was granted a (seemingly rare) straight B1 visa.
That visa was granted for 3 years and is going to be valid for a long time. Right now, however, I'm looking to make another trip to the US, this time to visit a friend (so, no business intentions). Does this mean I have to explicitly apply for another, B2, visa all over again? Or, if I do travel with my current B1, I can avoid the problem somehow?