If this is going to the 'official' response thread for this issue, then I'm going to repeat what I've already expressed in another forum...
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I basically agree with Pete when it comes to #1. Some people choose to include clear information about themselves in their signature. For example, I joined ET in 2006 based on a request by a customer to look at posts which were being written in the forums for our software product(s). This was how I first learned about ET, from one of our customers. Since my role in the company was to interface with customers when it came to their needs and requirements as well as to provide insight into why we were making certain investments and enhancements, it was felt that participating in ET should be part of my job as my title at the time was 'Product Evangelist' (at least this is how it was put to me by that customer).
After spending some time 'lurking' in the forums, I came to the conclusion that the customer was probably right, that it would be beneficial to both our company and our customers if I became a member of ET and acted as a representative of the company in the relevant forums. When I brought this idea to my boss, she insisted that I NOT post using an anonymous ID as she felt that this was critical to both my credibility, to say nothing of the company's, and to meet our corporate policies involving employees use of 'social media' during their daily tasks. Therefore I used my name as my ID and created a signature which identified me as an employee of Siemens along with my title (I changed my signature when I retired in 2016 since I no longer represented Siemens, but I left my name and location intact, as well as the link to Siemens' website). And before anyone asks, I had a personal discussion at the time with Dave Murphy (the founder of ET) where I explained what I was going to be doing and what restrictions I was going to be operating under (to comply with Siemens corporate policy). We came to an agreement which included his concurrence that my signature clearly indicate that I was a Siemens employee. He also had some 'rules' of his own which he asked me to comply with, which I presented to my boss and to which she agreed. Only then did I start to regularly login to ET and post in the relevant forums.
The point I'm trying to make is that having an explicit and verbose enough signature to get the job done was critical to both my management and that of ET, at least at the time. Note that there are other individuals who post here who have very clear signatures which makes it known who they are and what they do (while complying with the rules covering personal contact information). To take that option away, by disallowing signatures or by limiting them to a single line, would diminish the value that both the poster and the reader gains from knowing who they're dealing with. Now, please do NOT take this as a request that ALL members of ET must have a signature, I would never advocate that as I know that there are many reasons why some people want or need to remain anonymous (for both personal and professional reasons).
So in conclusion, this is why I'm opposed to only having a signature appear with an individual's first post in a thread. If they've taken the time to define a signature and have given thought to what to include and why, that information should be visible to the readers. Besides, they may be here operating under the same sort of rules that I did for 10 years, where I had been told that I must not try to hide who I was and who I worked for.
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As for the five proposals, my votes are
#1 = NO
#2 = NO, not a single line. I suggest that it be limited to 4 or 5 lines.
#3 = YES, but I wouldn't want the use a smaller font, that's just inane.
#4 = NO
#5 = This is just making things even more complicated.
There, you now have my votes and my opinions.
John R. Baker, P.E. (ret)
Irvine, CA
Siemens PLM:
The secret of life is not finding someone to live with
It's finding someone you can't live without