From the character limits of social networks to the requirements of extensive documents in the corporate configuration, if you have been writing words, then you have been operating with text counts, whether you know it or not.
Twitter have the 280 character limit;
Facebook does not allow you to post anything with more than 63.206 characters or even to comment using more than 8.000 characters;
Instagram have 30 characters hashtag limit, 150 characters bio description and 2.200 characters in post which are then truncated at 125;
Blog posts or article, to be ranked higher on Google by his crawler, should be around 1800 words.
You need to be very careful all the time, making sure that the content stays within the limits of these online platforms.
This tool provide you content validation on social network with just one click.