Is it tacky to invite guests to your shower via a Facebook event?

Erika • 💙 5.12.15 💙 11.29.18
My sister is hosting my shower in a few weeks. We have put together a guest list and she created a Facebook event for the shower. Several people have already rsvp'd but I just don't want everyone talking about how tacky it is to only do fb invites lol would you think that was poor manners? Or is it acceptable considering that it is 2015 and pretty much everyone is on Facebook on their smart phone? 

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