1. I need to log in Facebook.
2. I need to log into Facebook.
Are these sentences grammatically correct?
anonymous 2. I need to log into Facebook. That one is good.
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anonymous2. I need to log into Facebook.
That one is good.
"log into" is a phrasal verb.
If there is no object, then you can use "log in."
For example:
Click on this link. It will take you to Facebook. Then you can log in.