Is first impression necessary for a relationship?

Sometimes, the first instinct is very important. But it can decieve as well. As always in life, there is no guarantee for anything.

Very well said

You make it sound as if you could avoid a first impression.

And yes, it is important. That's why online it's important to have a good profile and profile photo.

They say, "You never get a second chance to make a first impression."

First impressions on a date are important in my opinion, it just may win you that second date and a possible relationship.

Impression is a judgement made about you by another person based on your behavior as demonstrated.

'First impression' is the judgement they make about you based on your behavior when they first encounter you. Since people tend to be uneasy, guarded or nervous when meeting strangers the judgements formed are not entirely accurate to define your personality.
The only way for another person to adequately determine your personality is to interact with you over time during unscripted, natural behavior.

My first impression on most of the ladies are fake and/or out of the area. If they text you it is always a number out of California and when you ask them to call they come up with a lame excuse. Oh, and most these ladies use Google Hangouts or WhatsApp and in my experience people who use Google Hangouts or WhatsApp genuinely beg for money.

Only for the non scary ones.

Fist impressions last.

whether right or wrong.

Yes very important to me!

you only get one shot at making a good impression... so make it count !!