To whomever may happen to read this who can actually address this issue:
Enough is enough Square. I realize that you have little control over who signs up for and plays in Eorzea, but after playing for over a year at this point, I am frankly tired of having my Blacklist constantly capped at 200 individuals - the majority of which are level one characters with a name consisting of "Hfljlsdf Lpaijf" or something along those lines.
Now that that irritation is off of my chest, here's a suggestion or five:
1) Add an ingame feature to the chat log that allows you to file a report by selecting a characters name. You did this with the "Blacklist" feature. A couple of options: "Report Spam", "Report Harassment", etc. Whether or not you decide to have it open a small form for the user to fill out, or just have it file a small sub-report which uploads to the server, is completely up to you.
2) While this suggestion is a bandaid on this issue: increase the blacklist size from 200 to, oh, I don't know, 500? Basic, simple, not nearly as effective as people would hope.
3) Increase monitoring of server side chat logs. The fact that a level 1 individual (for example) is sending out hundreds of direct tells and friend requests to essentially everyone in a particular zone should raise some flags...I mean, really, it should, right????
4) Please patch friend requests. RMT Sellers / Spammers are sending tells pandering their goods and promptly following up with friend requests. The reason they're doing this is because currently if someone sends you a friend request, You. Can't. Blacklist. Them. Please separate the two or adjust how they function. Instead of having a friend request block someone from being blacklisted, make it so blacklisting someone automatically declines their friend request.
5) This goes hand in hand with suggestion #1. Please refine the in-game reporting of harassment feature. Square requests a "Username of of the person who conducted the behavior" and the approximate time, location, world, and type of behavior they were conducting. This form does not need to be this "clunky". Again, it should be very possible with server/client technology to have a small pre-determined report that a user can open on an individual from the chat log.
In a nut shell, there are some serious improvements that need to be made to this system and adjustments that need to be taken to improve the overall health and attitude of the community.
These are merely my suggestions and I am certain that there are a multitude of similar posts and reports like this that the Support Desk receives on a weekly basis. Please please please Square, take this seriously and help put an end to this cancer that is eating away at the enjoyment of Eorzea!
TL;DR - Suggestions for how to possible improve the social aspect of the game by helping to eliminate RMT Spam.
Hopefully this doesn't fall on deaf ears, but this is just my 2 gil.