Seems odd to me as well. The revenue comparisons don't compare also. Snap inc has growth though and that seems to be more valuable to them. Makes me think a few fixes and a return to growth and valuations jump drastically.
The hilarious thing is that in order for Snapchat to compete with TWTR... they have to be like TWTR... and they have a looong way to go from transiting disposable nudie pics to being a world wide instant news outlet that can help topple governments like TWTR.