Lenght of Meta Titles & Description and Click Through

[gavacho]

There are guidelines here and there about the recommended amount of characters to use for these metas.
I always thought that made sense on an aesthetic point of view on the SERPs display not to have the "..." because of the limited amount of charachters.

Several questions though:

1. if a keyword is not displayed in the Title does it have a negative impact in rankings?
2. what about click through from a SERP with a meta title and/or description not being shown completely. Does it have positive impact by raising the curiosity of the searcher?

Thanks for sharing your experience!

[Mark]

1. if a keyword is not displayed in the Title does it have a negative impact in rankings?

1. what about click through from a SERP with a meta title and/or description not being shown completely. Does it have positive impact by raising the curiosity of the searcher?