Freemasonry was NEVER a secret. In fact the first 'exposure' of Masonic ritual was published abut 1696 some 20 years before the Premier Grand Lodge of London even formed into what we know today as Freemasonry. If you check the news archives there are published meeting dates and times of Masonic meetings going all the way back to 1720's.
At this point in history the only places to meet were Taverns and Inns as they had the room.
As for posting pics inside a Lodge, this has become quite common place, especially in the US. Many Lodges and Lodge members have webpages, FB accounts and routinely post pics of special events. Where I am from there are a few rules though. You cannot post pics of members until they have been given the 3rd (Master Mason) degree and only with their permission.
Many Lodges have historical buildings in the towns they're in so of course typically they are proud of their history in a town and the building they work so hard to build and maintain.
Yes younger men are now knocking on the doors of the Lodge more often. Personally I am glad to see this as in a typical Lodge you would see some 70+ members and some 40's, 30's and even 20's. The 50s and 60 year olds are not as well represented as they avoided Freemasonry after the turbulence of the 60's and 70's and anti-establishment sentiments. The baby boomers.
So now a new generation is discovering what this generation missed. Freemasonry the original social network.
As for some answerer's theories..well they are just that...theories and he/she really wouldn't know now would they. Freemasonry is not for everyone, each joins for their own reasons and they are not easily allowed in as some answerer suggested.
The symbols of Freemasonry are taken from the operative stone masons tools, the ones who built the magnificent cathedrals, churches and castles of the middle ages and used to communicate serious truths. Many of the 'symbols' you listed are not symbols of Masonry at all, but decorative in nature, like a motif.
So now that you know that Freemasonry is NOT a secret society, our buildings are adorned with the square and compass and usually posted meeting times and dates, listed in phone directories and now published on websites and FB page among others.
I suggest you pick up Freemasonry for Dummies by Chris Hodapp and it will give you a much better background on this not so secret organization. BTW there is a difference between privacy and secrecy. Short or that you can go here: http://www.askafreemason.org and have a look around and check out the Ben Franklin Chats, join the forum and ask Freemasons your questions.
To fend off the wacky conspiracy theories you can see here: http://www.masonicinfo.com and read all about the wacky world of anti-Masons.